There are different things that happen in both parks for NYE, but I've only experienced it DL. I've been in front of the castle many years & it is seriously packed! There is a small stage show w/ some singers & sometimes characters will come out too. When the performers are not out, a DJ will play music & all this obviously happens before the countdown. There are also other places w/ DJs like by IASW & TLT. I believe the Plaza Pavilion has a live jazz band so ppl can dance on the dance floor. Last year, I was by the Rivers of America & they had musicians (not the ones you'd see everyday @ DL) on a raft floating along the river.